One of the 20th Anniversary wallpapers shows the evolution of the Ubuntu logo, which has had three renditions to date. Another is the brown Warty Warthog default wallpaper, but the old Ubuntu logo ...
It did for app menus what tapping the Windows key and typing does for app launchers. Ubuntu's logo retains its essential shape, so it's easy to forget just how much the logo has changed with time.
If you have a Windows 11 icon, you can upload it here. I've picked the Ubuntu logo for this tutorial. Also, change the Icon Size to 33. Next, let's tweak Blur my Shell settings. From the Panel tab ...